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D. E. BANGS.

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'ilNTTnn STATES PATENT Trice,

- DAVID E. BANGS, OF MEDFORD, MASSACHUSETTS.

G RATE.

SPECIFICATION forming part of Letters Patent No.371,917, dated October25, 1887A Application filed August 31, 1886. Serial No 212,330. (Nomodel.)

To all whom, it may concern.-

Be it known that I, DAVID E. BANes, of Medford, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Grates for Stoves,

Furnaces, die., of which the following is a full,

clear, and exact description.

This invention consists of agrate for a stove` or furnace, &c.,constructed and arranged for operation, all substantially as hereinafterfully described, reference being had to the accompanying plate ofdrawings, in which* Figure l is a plan View; Fig. 2, a verticalcrosssection on line 2 2, Fig. l; Fig. 3, a vertical longitudinalsection on line 8 3, Fig. l; Figs. 4land 5, detail views, to behereinafter referred to.

In the drawings, A represents a flat rectangular frame of cast-iron orof any suitable material, 'and adapted to t within a firepot orcombustion-chamber of a stove or furnace, Ste. On each side bar, B, ofthis frame are upwardly-proj ectin g walls C D, connected at their topby a plate, E, and at their ends, and forming between them alongitudinal vertical chamber, G. Each bar B has a series of openings,H, through it, forming communication with said chamber, and each innerwall C has a number of vertical openings, J, communicating with thechamber, the side walls C being slightly inclined from the bottom towardthe back walls, D, which are substantially vertical.

K is a iiat grate, of cast-iron or of any suitable material, havingopenings L through it and having upwardly-projecting pipes or tubes M,each making a tubular chamber, N, having an opening, P, in the gratecommunicating therewith, and being open at their upper ends, as at Q,forming a free passage through the grate and each pipetube. Each ofthese pipes or tubes M has a number of elongated openings, R, in itsside walls, in the present instance four in each tube, and extendingfrom the grate portion up nearly to the upper end of the tube. The grateK is adapted to fit within the frame, and at each end it hasalongitudinally-projecting central pin, T, which lies within arespective bearing, U, in the end bar, V, of the frame, and by which thegrate 5o can swivel or turn. within the frame when desirous of clearingthe grate of ashes, the., as usual in grates.

The frame A is of a size to fit closely within the walls of a fire-potor conlbustion-chamber of a stove or furnace, &c., and can be cementedtherein to close up the space between its edges andthe walls ofthefire-pot; or it can be adapted to be inserted therein and removed atpleasure.

In the use of a grate constructed according to this invention in astove, dre., the coal or coke is placed within the fire or combustionchamber of the stove, between the chambered walls, and around about'andover the several tubes or pipes and ignited, and as the material burnsair from the outside of the stove passes up through the usual openings,L, in the grate, up through the openings H into the wallchambers, andout at the openings J; also up through the openings P into thepipe-chambers N and out at their elongated openings R in their sidewalls, and out through the openings Q in the tops of the tubes into theiirechamber and among the coal or coke being burned. By such anarrangement of the wallchambers and the pipes or tubes with theirrespective openings for the circulation of air a complete and perfectcombustion of the material within the combustion chamber will beaccomplished, because a full and complete supply of oxygen is secureddirectly to all portions and particles of the fuel within thecombustion-chamber, so that a pure heating ire, and free of carbon andsmoke, will be pro duced, thus insuring the greatest amount of heat fromthe material being burned in the combustion-chamber.

The opening at the top of the tubes is essential, as it prevents theburning out of the npper part of the tube by the material being burned,as would be the case if closed up and solid.

This invention is particularly adapted to furnaces for locomotives,where perfect combustion and a high degree of heat and freedom of carbonand smoke are essential.

The grate can be adapted to any form of firepot'das, for instance, acircular fire-pot, as well as a rectangular one, as shown-and in thecircular one the wall-chambers would be preferably continuous around thesame; also,

the wall-chambers can be at the ends as well as at the sides. I They canbe on the grate K, instead of the frame portion, dispensing with theframe, the frame and grate being one; or they can be dispensed with andthe tubes only used. A more orless number of tubes can be used, asdesired. The tubes can be straight, in lieu of tapering, as shown, andthe openings in the tubes and walls can be of any suitable or desiredform, although enlongated and extending upward, substantially as shown,is preferable. The grate, with its tubes, can be cast in one piece ofany suitable material, as also the frame and its walls; or they can beconstructed in any suitable manner and of any suitable metal.

In Fig. 4 a tube is shown in vertical crosssection enlarged; and Fig. 5is across-section on line 5 5, Fig. 4C.

Having thus described my invention, what I claim is 1. A grate for adre-pot of astove, &c., having` a series of vertical tubes, M, locatedon each side of the center thereof, and having vertical elongatedopenings in the sides and open at the top and bottom, substantially asde- -V scribed.

2. A grate for a fire-pot of a stove, 85e., having chambered side wallsprovided with open` ings H and J, in combination with a series of 3oDAVID E BANGS.

yWitnesses:

EDWIN W. BROWN, PnRcY BRYANT.

